DOWNLOAD LG 32LN549E (CHASSIS:LA3AA) Service Manual ↓ Size: 5.98 MB | Pages: 34 in PDF or view online for FREE

Model
32LN549E (CHASSIS:LA3AA)
Pages
34
Size
5.98 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
32ln549e-chassis-la3aa.pdf
Date

LG 32LN549E (CHASSIS:LA3AA) Service Manual ▷ View online

- 12 -
6. GND and HI-POT Test
6.1. GND & HI-POT auto-check preparation
(1)  Check  the  POWER  CABLE  and  SIGNAL  CABE  insertion 
condition
6.2. GND & HI-POT auto-check
(1)  Pallet moves in the station. (POWER CORD / AV CORD is 
tightly inserted)
(2) Connect the AV JACK Tester.
(3) Controller (GWS103-4) on.
(4) GND Test (Auto) 
     - If Test is failed, Buzzer operates.
     -  If  Test  is  passed,  execute  next  process  (Hi-pot  test). 
(Remove A/V CORD from A/V JACK BOX)
(5) HI-POT test (Auto)
     - If Test is failed, Buzzer operates.
     -  If  Test  is  passed,  GOOD  Lamp  on  and  move  to  next 
process automatically
6.3. Checkpoint
(1) Test voltage
    - GND: 1.5KV/min at 100mA
    - SIGNAL: 3KV/min at 100mA
(2) TEST time: 1 second
(3) TEST POINT
    - GND Test =  POWER  CORD  GND  and  SIGNAL  CABLE 
GND.
    - Hi-pot Test = POWER CORD GND and LIVE & NEUTRAL.
(4) LEAKAGE CURRENT: At 0.5mArms
7. AUDIO output check
7.1. Audio input condition
(1) RF input: Mono, 1KHz sine wave signal, 100% Modulation
(2) CVBS, Component: 1KHz sine wave signal (0.4Vrms)
7.2. Specification
No
Item
Min
Typ
Max
Unit
Remark
1
Audio practical 
max Output, L/R
(Distortion=10% 
max Output)
9.0
8.5
10.9
9.3
12.0
9.8
W
Vrms
(1) Measurement 
condition
- EQ/AVL/Clear 
Voice: Off
(2) Speaker 
(8Ω Impedance)
(3)  32/37/42/47/55 
INCH
2
Audio practical 
max Output, L/R
(Distortion=10% 
max Output)
4.5
6.0
5.2
6.45
6.24
7.07
W
Vrms
(1) Measurement 
condition
- EQ/AVL/Clear 
Voice: Off
(2) Speaker 
(8Ω Impedance)
(3) 26 INCH
* USB S/W Download (option, Service only)
(1) Put the USB Stick to the USB socket.
(2) Automatically detecting update file in USB Stick.
-  If your downloaded program version in USB Stick is Low, 
it didn't work. But your downloaded version is High, USB 
data is automatically detecting
(3) Show the message "Copying files from memory"
(4) Updating is staring.
(5)  After updating is complete, The TV will restart automatically.
(6)  If TV turns on, check your updated version and Tool option. 
(refer to the next page about tool option)
*  If  downloading  version  is  higher  than  your TV  have, TV 
can  lost  all  channel  data.  In  this  case,  you  have  to 
channel recover. If all channel data is cleared, you didn't 
have a DTV/ATV test on production line.
After downloading, TOOL OPTION setting is needed again.
(1) Push "IN-START" key in service remote controller.
(2) Select "Tool Option 1" and Push “OK” button.
(3) Punch in the number. (Each model has their number.)
- 13 -
7. Test factor for commercial model
7.1. RJP TEST (Only US model)
7.1.1. Overview
▪ Jig(Commercial Check JIG)
▪ RJ45 cable
▪ Power only mode
7.1.2. Test sequence 
(1) Operate JIG(Commercial Check JIG) as shown on picture1
(2)  Turn  on  TV  and  press  “P-ONLY”  key  on  adjustment 
remocon.
(3) Connect RJ45 cable into RJP port of the TV set.
(4) Connect RJ45 cable into the JIG.
(5) If shown “OK” it’s normal, “NG” it’s defect. 
(6) If defect, check the connection once again as done above.
(7)  If the signal power is no good, check the connection of RF 
cable.
8. External Speaker Out
(1)  Connect  external  speaker  to  speaker  out  port  with  phone 
jack on TV side as below
(2)  Check  the  Max.  speaker  output  is  1W  or  not.  Sine  wave 
with 1KHz will be displayed
(3) Check Both of the signal in speaker.
     (Power only mode -> Fived 1W Default)
     ->  Check the input signal(1KHZ, Sine wave) and the wave 
of output by utilizing oscilloscope
RJP port
Recommended Input Signal 
  : RF, 1kHz, Sine wave 
- 14 -
TROUBLE SHOOTING
1. Power-up boot check
Check stand-by Voltage.
P401 3, 5pin : +3.5V_ST
Check 18pin Power connector
M ain B/D 3.5V Line
Short Check
Check X201 clock
24 M Hz
Replace X201
Check P401 PWR_ON.
1pin : 3.3V
Replace M star(IC101) or M ain board
Check M ulti Voltage
P401 9, 10pin  : 24V 
/ 13, 14, 15pin:12V
Replace Power Board
Check DRV ON Control
P401  2 pin : High
Check Power Board
Check IC402/3/7 Output  Voltage
IC402 : 2.5V
IC403 : 1.15V
IC404 : 1.5V
Q408  : 3.3V
Replace IC402,  IC403,  IC404,  Q408
Re-download software.
Check stand-by Voltage
L402, L403  : +3.5V
Replace L402, L403
Check LVDS Power Voltage
Q406  : 12V
Replace Q406
Check M star LVDS Output
Replace M star(IC101) or M ain Board
Change M odule
ok
ok
ok
ok
ok
ok
ok
ok
ok
No
No
ok
Replace Power board.
ok
No
No
No
No
No
No
No
No
- 15 -
2. Digital/Analog TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L1003
Replace L1003
Check Tuner 1.8V Power 
IC1001  2 pin : 1.8V
Check IF_P/N Signal
TU1002 10/11 Pin
Replace IC1001 
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
3. AV Video
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK701, CVBS Signal Line
R246
ok
ok
ok
No
Replace Jack
ok
Check CVBS_DET Signal
R705
Replace R705
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
No
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